# time
S = SEC = SECOND = 1.0
MSEC = MILISECOND = SEC / 1000.0
USEC = MICROSECOND = MSEC / 1000.0
NSEC = NANOSECOND = USEC / 1000.0
M = MIN = MINUTE = 60.0 * SEC
H = HOUR = 60.0 * MIN
D = DAY = 24.0 * HOUR
W = WEEK = 7.0 * DAY

# distance
MT = METER = 1.0
CM = CENTIMETER = MT / 100.0
MM = MILIMETER = MT / 1000.0
KM = KILOMETER = 1000.0 * MT
